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Solution for leakage of imported regulating valve

1) Increase the sealing grease method
For valves that do not use seal grease, consider adding seal grease to improve stem seal performance.

2) Add filler method
In order to improve the sealing performance of the filler to the valve stem, a method of increasing the filler may be employed. Usually it is a double-layered, multi-layered mixed filler form, which simply increases the number. For example, if you increase 3 pieces to 5 pieces, the effect is not obvious.

3) Replacement of graphite filler method
The PTFE filler used in large quantities has a working temperature of -20 to +200 ° C. When the temperature is higher at the upper and lower limits, the sealing property is significantly reduced, the aging is fast, and the life is short. Flexible graphite fillers overcome these shortcomings and have a long service life. Therefore, some factories have changed the PTFE filler to graphite filler, and even the newly purchased regulator valve has replaced the PTFE filler with graphite filler. However, the use of graphite fillers has a large difference in backlash, and some of them also have creeping phenomena at the beginning, which must be considered.

4) Change the flow direction, set P2 at the stem end method
When ΔP is large and P1 is large, the seal P1 is obviously more difficult than the seal P2. Therefore, the method of changing the flow direction can be adopted, and P1 is changed at the valve stem end to P2 at the valve stem end, which is more effective for a valve having a high pressure and a large differential pressure. For example, bellows valves should normally consider sealing P2.

5) Using the lens pad sealing method
For the sealing of the upper and lower covers, the valve seat is sealed with the upper and lower valve bodies. If it is a flat seal, under high temperature and high pressure, the sealing performance is poor, causing leakage, and the lens gasket can be used instead, and satisfactory results can be obtained.

6) Replace the gasket
Up to now, most of the sealing gaskets still use asbestos sheets. At high temperatures, the sealing performance is poor and the service life is short, causing leakage. In this case, you can use a wound gasket, an "O" ring, etc., which is now used in many factories.

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